postgresql automatic failover

Introduction to the high availability of a replica set the replica set achieves high availability through automatic failover. When the master node fails, the slave node can be elected as the master node, in most cases, this process is automatically performed without manual intervention. In some cases, data rollback is required for automatic

MySQL high availability solution: MHA-based Automatic Failover Cluster bitsCN.com MySQL high availability solution: MHA-based Automatic Failover ClusterComparison of common high availability solutions for MySQL (from the official manual) Only MySQL Cluster and DRBD + Heartbeat are available for

MySQL high availability solution: MHA-based automatic failover ClusterComparison of common high availability solutions for MySQL (from the official manual)Only MySQL Cluster and DRBD + Heartbeat are available for automatic database failover. These two HA solutions do not depend on Replication.However, the configuration

OverviewIn the RAC environment to configure Ogg, in order to achieve the RAC node failure, Ogg can automatically failover to the normal node, to ensure that two points:1. ogg's CHECKPOINT,TRAIL,BR file is placed on the shared cluster file system, and the RAC nodes can access the2. Cluster software is required to monitor the Ogg process and automatically restart Ogg (failover) on the normal node in the event

The election plays a very important role in the operation of the replica set. During the election, there is no master node in the replica set, and the client's reading request is unacceptable. The election plays a very important role in the operation of the replica set. During the election, there is no master node in the replica set, and the client's reading request is unacceptable. Introduction to the high availability of a replica set The replica set achieves high availability through

Problem Database mirroring has become a popular feature in SQL Server 2005. With the following simple steps, using the SQL Server Management suite or running some T-SQL commands, you can easily create database mirroring in one or more of your databases. One of the configuration options for database mirroring is high availability mode. With this option, the principal, mirror, and witness three servers are placed in the appropriate location. This is the only option that allows

Keepalived + redis implement high-availability automatic failover and keepalivedfailoverKeepalived + redis for high-availability automatic failoverInstall redis and keepalived on server A (10.0.11.2) and server B (10.0.12.2)A is the default master and B is the slave (add SLAVEOF 10.0.11.2 6379 TO THE redis configuration file ).Redis on A and B All enable localiza

Introduction to the high availability of a replica set The replica set achieves high availability through automatic failover. When the master node fails, the slave node can be elected as the master node, and this process is automatically performed in most cases, manual intervention is not required. In some cases, data rollback is required for automatic

Slave status\g ' |grep "Slave_io_running" | awk ' {print $} ')slave_sql_running=$ (MYSQL-U$USER-P$PASSWORD-E ' show Slave status\g ' |grep "Slave_sql_running" | awk ' {print $} ')echo "plese fix the server of $IP error now!" > $mysql _path/letterletter= $mysql _path/letterMYSQL-P$PASSWORD-E "Use test;"if [[$?! = 0]]ThenMail-s "{$ip}_database connect lost the srcprits fix It Now"$email Killall-9 HeartbeatKillall-9 mysqld/etc/init.d/mysqld startSleep $sleeptimeMYSQL-P$PASSWORD-E "Use test;"If [$?

may consider configuring persistence on the slave instance. When the master instance goes down, you can manually or automatically promote the master instance from the instance to continue providing services! After the master instance is restored, the data is synchronized from the original Instance. After the synchronization is completed, the data is restored to the original master-slave state! To meet this requirement, we need the cooperation of keepalive. On the one hand, keepalive provides VI

Keepalived VIP automatic failover Keepalived: 1. The keepalived process is stopped. 2. track_script detection failed in keepalived. Haproxy Detection: Vrrp_script chk_haproxy {Script "killall-0 haproxy" # cheaper than pidofInterval 2 # check every 2 secondsWeight-2} Switch related logs: tail-f/var/log/messages Keepalived_vrrp [1, 32408]: VRRP_Script (chk_haproxy) failedKeepalived_vrrp [32408]: VRRP_Instance

: -: GenevaINFO [7f2cb44a4700] [routing:failover] listening on0.0.0.0:7001; read-Write .- to- - A: -: atINFO [7f13125a2700] [routing:failover] listening on0.0.0.0:7001; read-Write .- to- - A: -: atINFO [7f2816b4a700] [routing:failover] listening on0.0.0.0:7001; read-Write .- to- - A: at:WuyiINFO [7fec2b5f4700] [routing:failover] listening on0.0.0.0:7001; read-Write .- to- - A: -:GenevaINFO [7ff971019700] [routing:failover] listening on0.0.0.0:7001; read-write [[email protected] bin]# MySQL-U

Db2+hadr+tsa High Availability Test--DB2HAICU Configure TSA for automatic failover of faults Network architecture Must be configured on the standby node first [Root@db2-node02 ~]# Su-db2inst2 [Db2inst2@db2-node02 ~]$ DB2 "Get snapshot for database on GHAN" HADR status Role = Standby Status = Peer Synchronous mode = Synchronous Connection status = Connected, 2015-12-24 08:32:52.872408

Automatic failover of MHA Based on consul architecture, consulmhaIntroduction For a long time, we have not enabled the masterha_manager automatic switch script online, because the database cannot be accessed due to network jitter (network cable, Cabinet switch instability. for example, restarting the NIC of the machine where the detection script is located does n

least 3 node server (English is not good, we can see it)Related documents: http://docs.couchbase.com/admin/admin/Tasks/tasks-nodeFailover.html3, the effect of testing, heheFinally said two, the elder brother spends nearly 3 days to ponder Couchbase's cluster and the failover plan, the middle difficulty, but fortunately did not give up, finally solves the problem.Then the problem came, brother busy to Busy, you reckoned write useful words, give a prai

SQL Server configuration database mirroring, there may be friends will be more confused, you do two database out, their IP address is not the same, when the database switch past, my database connection string can be good? Do you have to control which database is connected in the code?In fact, the problem is that using ADO or SQL Native client to automatically connect to a failover partner, the connection string looks like this:Connectionstring= "DATAS

protected] ~]# ll/mnt/Total dosage 20-rw-r--r--1 root root 884 August 13:50 Inittabdrwx------2 root root 16384 August 13:49 lost+found13. DRBD Dual Main Mode configuration exampleThe first time you set a node to become the primary node in DRBD 8.4[Email protected] ~]# Drbdadm primary--force R0Example of configuring a resource dual Master model:Resource R0 {NET {Protocol C;Allow-two-primaries Yes;}startup {Become-primary-on both;}Disk {Fencing Resource-and-stonith;}Handlers {# Make sure the othe

Optime: Read Oplog.rs collection. The last time the instance was changed.MongoDB uses lastheartbeat for automatic transfer.The Mongod instance sends a heartbeat packet to the other members every two seconds, and the member's state is judged by the health of the member returned in Rs.status (). If the primary node is unavailable, then all secondary nodes in the replication set will trigger an election operation. Select the new primary node. If there a